EPA Method 500 Series Internal Standard Back Catalog number: 31004 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 8467.4 Anthon, , Solvent-, Unit , # of units-, Cas.no. Price on request 72605 Trimethoprim Price on request 0416.13-150-CY n-Tridecane, ?13C: -33.47, 150µg/mL, Solvent-cyclohexane, Unit 1mL, # of units-1, Cas.no. 629-50-5 Price on request